asdfasdf - Inland Empire Water Garden and Koi Societyiewgks.org/pdfs/Phosphate-Green...
Transcript of asdfasdf - Inland Empire Water Garden and Koi Societyiewgks.org/pdfs/Phosphate-Green...
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Jackie Kabrell 6-20-2015
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What is phosphate?
Where does it come from?
What does it do in my pond?
Why do I care?
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Excess phosphate or phosphorus ◦ Will cause algae to grow faster than an ecosystem
can handle
◦ Makes our ponds green
Planktonic (pea soup) algae
String algae
◦ Can’t see our fish or other plants
Algae consumes oxygen at night ◦ Potential fish stress
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PO4-3
◦ A molecule of phosphorus and oxygen
Essential ◦ Phosphorus is an essential nutrient for plant (Algae)
growth
Required for photosynthesis
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Eliminate any leg … and the stool fails.
Nitrogen and Phosphorus are both essential Nitrogen is plentiful Phosphorus (phosphate) can be managed
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Natural & Human Sources ◦ Soil & rocks
◦ Wastewater treatment plants
P added to process the water
◦ Runoff from lawn fertilizer
◦ Commercial cleaning solutions
◦ Municipal Water – added to condition/protect conduit
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Koi Ponds ◦ Fish poop
◦ Uneaten Fish Food
◦ Decaying Plant Matter
◦ Bird Poop (& turkey poop! Turkeys love my waterfall)
◦ …
◦ And very possibly your source water
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By the POND BOSS magazine
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1- Orthophosphate ◦ basically plant food and the type of phosphate
found in fertilizer
◦ Bio Available or Reactive
2- Organically bound phosphate
◦ Living matter (algae, plants)
Becomes bio available (orthophosphate) after bacteria breaks it down.
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Condensed (Polyphosphates) ◦ Added to municipal water supplies to prevent
formation of scaling in pipes.
Total Phosphate ◦ the sum of the above three.
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(koi)
Organic and inorganic phosphorus are shown in this cycle. Plants and algae consume the inorganic phosphorus, orthophosphate,PO4
-3. When algae dies it releases P which is often consumed by another algae bloom.
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P or PO4-3
Lazy ◦ Used interchangeably
◦ But not the same.
PO4-3 is measured in PPM
P is measured in PPB
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Fuzzy Measurements
◦ When water is green
◦ Can’t see your fish
◦ Can’t see your plants
◦ Fish piping in the morning (hopefully this never happens)
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Scientific Measurements
◦ Measure P (PPB or µg/L)
◦ Measure orthophosphate PO4-3 (PPM or mg/L)
◦ Be Careful … about the units
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Orthophosphate (inorganic) ◦ Common methods do not detect organic phosphate
◦ But usually do not detect “bound” phosphate
Important WRT treatments
Indicator of a potential algae
Threshold ◦ 0.1 PPM
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P (inorganic) vs. Total P (organic + inorganic)
Orthophosphorus (inorganic) ◦ Common methods do not detect organic phosphorus
◦ Also do not detect “bound” phosphorus
Professional Laboratories ◦ Can provide Total P measurements
Threshold ◦ 30 PPB
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P
(PPB)
PO4
(PPM) Trophic State
5 0.015
10 0.031
15 0.046
20 0.061
25 0.077
30 0.092
35 0.107
40 0.122
45 0.138
50 0.153
60 0.184
70 0.214
80 0.245
90 0.275
100 0.306
105 0.321
110 0.337
Mesotrophic
Hypereutrophic
Eutrophic
Oligotrophic
Healthy levels
Runaway algae likely
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Used by industry, including the EPA, to quantify the problem of too much phosphorus in bodies of water
Four classifications of capacity of water to support life (algae).
P
(PPB)
PO4
(PPM) Trophic State
5 0.015
10 0.031
15 0.046
20 0.061
25 0.077
30 0.092
35 0.107
40 0.122
45 0.138
50 0.153
60 0.184
70 0.214
80 0.245
90 0.275
100 0.306
105 0.321
110 0.337
Mesotrophic
Hypereutrophic
Eutrophic
Oligotrophic
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Oligotrophic ◦ Supports little or no plant growth
◦ (Lake Pend Oreille)
◦ <12 PPB P
Mesotrophic ◦ may support some plant growth
◦ 12-24 PPB P
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Eutrophic ◦ Supports significant plant growth
◦ My pond today, most ponds today
◦ 24-96 PPB P
Hypereutrophic ◦ Supports excessive plant growth
◦ My pond last year
◦ 96-384 PPB P
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Measure and track both orthophosphate and total P if you can and you are interested to do so.
If you are only going to track one, ideally measure total P ◦ But this is time consuming and more costly
($15-20 per test)
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Source Water ◦ Essentially all P is Inorganic Phosphorus ◦ Are you introducing a problem with every water change?
Pond Water ◦ Difficult ◦ Inorganic and organic P in the water.
Most OTS tests detect inorganic only. ◦ Have a lab determine Total P. ◦ Get a sense of potential algae blooms with home meters ◦ Algae in the water may affect home measurements
(colorometers)
Compare Total P (source water vs pond water) ◦ Clue if you have additional significant sources of P from
fish food, decay, turkeys etc.
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Thresholds / Targets:
Total P : below 24 PPB Orthophosphate levels: near 0
Orthophosphate is indicative of the algae potential (So don’t expect to detect high orthophosphate during an algae bloom. Most phosphate will be consumed by the algae.)
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Convert PO4-3 to P
◦ P (PPB) = PO4-3 (PPM) *1000/3.06
Example:
Convert 0.122 PPM Phosphate to PPB Phosphorus:
P (PPB) = PO4
-3 (PPM) *1000/3.06 = 0.122 * 1000/3.06 = 40 P (PPB)
P
(PPB)
PO4
(PPM) Trophic State
5 0.015
10 0.031
15 0.046
20 0.061
25 0.077
30 0.092
35 0.107
40 0.122
45 0.138
50 0.153
60 0.184
70 0.214
80 0.245
90 0.275
100 0.306
105 0.321
110 0.337
Mesotrophic
Hypereutrophic
Eutrophic
Oligotrophic
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I think all over the counter products that measure Phosphate measure only Orthophosphate.
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Product Resolution: 5 PPM
Healthy pond threshold 0.1 PPM
(therefore Max desired resolution 0.05 PPM or less)
Inadequate by 50X
Using dip strips for Phosphate is like measuring the length of a pencil with a 66 ft ruler, with no markings.
(Accuracy is not stated for this product. Assume perfect accuracy)
Dip Strips
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Product Resolution: .25 PPM Healthy pond threshold 0.1 PPM (therefore Max desired resolution
0.05 PPM or less)
Inadequate by 5X Using kits like this for Phosphate is
like measuring the length of a pencil with a 6 ft ruler, with no markings.
(Accuracy is not stated for this
product. Assume perfect accuracy)
PondCare Master Liquid
Test Kit
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Product Resolution: 0.01 PPM
Product Accuracy: + 0.04 PPM
“Window of 0.08 PPM” for every measurement
Healthy pond threshold 0.1 PPM
(therefore Max desired resolution 0.05 PPM or less)
Useful to determine a problem
$47 plus 25cents/test
Using this checker is like using a 9” ruler to measure a 6” pencil.
Hanna Instruments HI713 Phosphate
Checker
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I think all over the counter products that measure phosphorus also measure only
bio-available (reactive, inorganic) phosphorus.
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Product Resolution: 1 PPB
Product Accuracy: + 4 PPB
“Window of 8 PPB” for every measurement
Healthy pond threshold 30 PPB
(therefore Max desired resolution 15 PPB or less)
Very Useful But….A word about variation of reagents
$47 plus 25 cents/test
Using this checker is like using a 3” ruler to measure a 6” pencil.
Hanna Instruments HI736 ULR P
Checker
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Professional Lab
Resolution: .0001 PPM (0.1 PPB)
Product Accuracy: + 0.01 PPM (10 PPB)
“Window of 20 PPB” for every measurement
Healthy pond threshold 30 PPB
(therefore Max desired resolution 15 PPB )
Very Useful
Measures TOTAL P (inorganic + organic)
$15-20/test
Using a lab is like using a 6” ruler to measure a 6” pencil.
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Secchi Disk
8” black and white disk
Lowered into the water
until it disappears from view.
Very Easy
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Total
Phosphate
(PPB)
Secchi Depth Trophic Class
0—12 >8—4m
(24-12ft)
Oligotrophic
(little or no support of plant life)
12—24 4—2m
(12-6ft)
Mesotrophic
(little to moderate support of plant
life)
24—96 2—0.5m
(6ft – 1.5ft)
Eutrophic
(supporting plant life)
96—384+ 0.5—<0.25m
(less than 1.5ft)
Hypereutrophic
(high plant life, choking)
Trophic State Index
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0
20
40
60
80
100
120
1.5 63.75’
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Similar as algae prevention ◦ Feed fish what they can eat in a couple minutes
◦ Remove excess food
◦ Remove decaying plant matter
◦ Remove leaves, etc
◦ Keep birds from the pond
See the POND BOSS article for the amounts of phosphorus in fish food, bird poop, etc…..
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Use a skimmer
Use bottom drains
Clean your filters
Get rid of sludge build up
When bacterial breaks down organic matter, it releases the phosphorus as inorganic phosphorus. ◦ …. And it supports new algae growth
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Getting rid of sludge build up
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Plants ◦ Try soil-less plants
Do Water Changes ◦ Watch your source water P levels.
You might be adding P. If so consider binding P prior to water changes (more later)
Flocculent ◦ Remove accumulated matter ◦ Watch PH. Non Bufferred Alum can induce PH swings.
A rule I found was that 1/3 C of baking soda will raise the Alkalinity (KH) of 1000 gallons of water by 25 PPM
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Phosphorus has to be “bio-available” to support algae growth.
Binding it makes it unavailable.
The Phosclear rep recommended this process when binding phosphorus in a green pond: First, use an algaecide. When the algae dies off in a couple days, it will release its phosphorus making it bio-available for a rebound algae bloom. Apply the phosphorus binder three days after the algaecide to bind the
phosphorus prior to the rebound algae bloom.
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Phosphorus that is bound will not be detected by common phosphorus or phosphate tests.
I believe a “Total P” test is required from a laboratory.
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Binding phosphorus will not kill algae.
It will prevent new algae from growing, until more P is introduced to the pond.
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Microbe-lift Pond Phosphate
Remover The MSDS is inconclusive (all “proprietary” materials). This
product binds phosphate. It will not affect pH, if dosed
correctly.
Application: 16 oz per 1600 gallons of water. (1 oz per 100
gallons) per 1.5 PPM phosphate. (That’s a HIGH concentration
of phosphate.)
This is the ONLY PRODUCT THAT ACTUALLY REFERS TO THE
POND WATER PHOSPHATE CONCENTRATION to meter the
dosage.
Cost: $9.56 per 16 oz container treats 1600 gallons on
www.123ponds.com
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Phosclear It’s an Alum product that binds phosphate and acts like a
flocculent.
This is a powder blended with sodium carbonate to buffer
the water against PH swings. It will not affect PH, if dosed
correctly. The manufacturers recommend that pH be
between 6.5 and 8.2. The reason is that – in very alkaline
ponds (above pH 8.2) the aluminum in these products can
react with the alkaline groups to form Aluminum Hydroxide
which can be toxic to fish.
Application: 4 oz (1/2 cup) per 1000 gallons of water
Cost: $38.09 for 16,000 gallon treatment.
http://www.phosclear.com/html/pond-treatment.html
Phosclear recommended process for a green pond: First, use an algaecide. When the algae dies off in a couple days, it will release its phosphorus making it bio-available for a rebound algae bloom. Apply the phosphorus binder three days after the algaecide to bind the phosphorus prior to the rebound algae bloom.
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EasyPro Phosphate Binder Binds phosphate. Provides approximately 70 beneficial trace
minerals. Buffers pH. Provides minor flocculation (settling) of
suspended particles
1 oz per 500 gallons.
5 lbs for $91.13 at www.thepondoutlet.com, treats 40,000
gallons
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The Pond Zinger by APS The Pond Zinger was Pond Trade Magazine Product of the Year in
2011. It uses an anionic polyacrylamide that acts as both a binder
AND a flocculant. It improves water quality in terms of clarity,
reduced phosphates, odor control, decreased suspended solids, and
metal discoloration removal.
Developed by Applied Polymer Systems, these pond pucks are
derivatives of product used for 20 years to control waste water
runoff from construction sites.
This product is NOT supposed to alter the pH of your water. This I
want to confirm.
Application: Install above an aerator, under a floating fountain, on
the steps of a waterfall or with any circulation mechanism.
Pond size: 500-12,000 gallons
Life expectancy: 1- 2 months
Price: $29.99 on Amazon or $23.99 at
www.store.lakeandpondsolutions.com/pond-zinger.html.
http://www.northcoastpets.com/pond_conditioning.htm
http://www.koiphen.com/forums/archive/index.php/t-137600.html
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Phosphorus The Green Fuel - Takeaways by Jackie Kabrell Jun 2015
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Phosphates can cause trouble with algae in ponds. Phosphates are a limiting nutrient for algae. Reduce P and reduce algae. Orthophosphates, those that are available for plant growth, cause the immediate trouble. Orthophosphates are consumed by algae and then they are not detectable using common methods. A professional lab is your answer for a total phosphorus reading. Orthophosphates get into your pond from pond waste. So keep it clean. They can ALSO come from your source water so know your source water. Phosphorus Target: < 30 PPB
Phosphate (PO4
-3) Target: < 0.10 PPM
Treatments: Phosphorus can be bound and made bio-unavailable. There are many products. Pond zinger (shown) is a slow release product & doesn’t affect PH. Microbe Lift Phosphate Binder is fast acting. I am intrigued by it because it advises treatment to be metered according to the levels of PO4
3- level in your water. Watch your pH.
Secchi disks are EASY! 5.5’ft is approx 30 PPB
phosphorus
Phosphorus The Green Fuel - Takeaways by Jackie Kabrell Jun 2015
P
(PPB)
PO4
(PPM) Trophic State
5 0.015
10 0.031
15 0.046
20 0.061
25 0.077
30 0.092
35 0.107
40 0.122
45 0.138
50 0.153
60 0.184
70 0.214
80 0.245
90 0.275
100 0.306
105 0.321
110 0.337
Mesotrophic
Hypereutrophic
Eutrophic
Oligotrophic
Healthy levels
Runaw
ay a
lgae lik
ely
Measuring P & Phosphate:
Phosphorus is measured in PPB and Phosphate is measured in PPM. Don’t be fooled by dip sticks. Look closely at your measuring devices and understand their accuracy and resolution. These checkers measure bioavailable PO4
-3 / P.
The two Checker devices from Hanna are about the only reasonably priced option for regular monitoring of P and PO4
3-
3-step approach:
1)Use algaecide. 2)After algae dies and releases the
now inorganic PO4-3, (3-4 days)
apply fast acting PO4-3 binder.
(Some binders also use flocculent to accelerate filtration)
3)Use slow release PO4-3 binder for
maintenance.
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